|Central coordinates||17o 23.50' East 59o 40.10' North|
|IBA criteria||A4i, B1i, C3|
|Altitude||3 - 35m|
|Year of IBA assessment||2000|
Ornithological information The IBA supports important numbers of passage wildfowl, and the surrounding arable land is an important feeding area. Species of global conservation concern that do not meet IBA criteria: Anser erythropus (up to 5 passage birds), Crex crex (1-3 breeding pairs) and Gallinago media (5-10 passage birds).
Site description Shallow (average depth 1 m), almost enclosed bay of Lake Mälaren, surrounded by wet, tussocky meadows which merge into drier pasture and fields. Deciduous copses overlook the bay and there is a conifer-covered hill with bare rock outcrops along the eastern edge. Only 30 ha of open water remain, the rest being choked by invasive Phragmites, Scirpus and Typha.
|Species||Season||Period||Population estimate||Quality of estimate||IBA Criteria||IUCN Category|
|Bean Goose Anser fabalis||passage||1996||3,000-5,000 individuals||good||A4i, B1i, C3||Least Concern|
|Greylag Goose Anser anser||passage||1996||4,000-5,000 individuals||good||A4i, B1i, C3||Least Concern|
|Protected area||Designation||Area (ha)||Relationship with IBA||Overlap with IBA (ha)|
|Hjälstaviken||Nature Reserve||808||is identical to site||800|
|Hjälstaviken||Wetlands of International Importance (Ramsar)||770||protected area contained by site||770|
|Hjälstaviken - SE0210077||Birds Directive||808||is identical to site||800|
|IUCN habitat||Habitat detail||Extent (% of site)|
|Forest||Broadleaved deciduous woodland; Native coniferous woodland||10%|
|Grassland||Humid grasslands; Mesophile grasslands||20%|
|Wetlands (inland)||Standing freshwater; Water fringe vegetation||40%|
|Rocky areas||Inland cliffs||5%|
|Artificial landscapes (terrestrial)||Arable land||20%|
|Land-use||Extent (% of site)|
|nature conservation and research||100%|
Management considerations Threats include overgrowth of grassland vegetation due to undergrazing and the effects of introduced American mink Mustela vison. Submerged aquatic vegetation has been greatly impoverished in recent years and this, together with the decreasing area of open water, has resulted in the decline of some bird species, notably ducks (`Other' threat). The water-level is artificially manageda more beneficial management regime was decided upon in 1996.
Protection status National High International High820 ha of IBA covered by Nature Reserve (Hjalstaviken, 821 ha). 770 ha of IBA covered by Ramsar Site (Hjälstaviken, 770 ha). IBA overlaps with Special Protection Area.
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Recommended citation BirdLife International (2013) Important Bird Areas factsheet: Lake Hjälstaviken. Downloaded from http://www.birdlife.org on 20/06/2013
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